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-rw-r--r--src/axis-manip.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/axis-manip.h b/src/axis-manip.h
index 032ee04ba..a0d019110 100644
--- a/src/axis-manip.h
+++ b/src/axis-manip.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Generic auxiliary routines for 3D axes
*
@@ -6,7 +7,7 @@
*
* Copyright (C) 2007 authors
*
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_AXIS_MANIP_H